I'm curious to see how it works for you. I've used goldenseal as a tincture for other things-colds and as a rinsing agent after I gave birth (for down there).
It is very bitter, so I'd take a quick tincture rather than sip a mug full. Good luck. I get sinus infections too, but didn't think about herbs.
oh, using a hot wet washcloth on your face can help the pain. Sometimes just heat over my sinuses helps a lot, let it sit on your face as long as you can. You can microwave wet wash clothes of get a teapot going. Use lotion afterwards because it does dry out your skin.